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Well who would have thought of that. Congrats

Then I would say you probably have carbon still in the combustion chamber. One thing you can do to get rid of it is trickle water down the intake at about 200 rpm. As much as it will take and not...

I have to say that I don't know what to say. I am completely unfamiliar with lambda. And I am baffled as to why your NOX is still high

I suppose that could be it

Have you tried running a tank of premium in it yet?

It takes the computers awhile. They are slow learners. Give it a couple of weeks

I really don't know. That is the only thing I can think of. If it only happens for a few seconds, see if it works itself out. Might be the computer has to relearn.

Hard to say on that. TPS may be getting a little worn out

I would start checking around at various smog stations. For instance, I have friends at the local 4X4 shop. But they are a gold station and they will not let me get away with my non stock air...

Dealers should. Also if you see any YJs with the 4.0, they will have the same engine parts. Check around for smog shops. I have gotten to know the guys in one that let a few things like hoses...

Are you going to a regular smog station or a gold station? The gold are more strict. You should be able to find original hoses at a pick and pull for a 95

Most likely it would make it run rich if it was a problem

A cat can just wear out and marginally fail. Just went through that on my pickup. But generally that is indicated by higher than normal hydrocarbons. How long since your O2 sensor was changed. A...